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Compound A has a chemical formula CsH1602. When A is refluxed in H20 and HCl, compound B (C6H120) and ethylene glycol (HOCH.CH,OH) are formed. Compound B can react with NaBH4 in ethanol followed by aqueous workup to give a new liquid product C (C6H140). Compound C when treated with conc. H2SO4 under heat gives D (C6H12). Treatment of compound D with 0; followed by reductive workup with (CH3)2S yields two products E and F. Compounds E and F have the same chemical formula C3H,0, and both of their IR spectra show a strong band at 1780 cm? The C NMR spectrum of E shows two signals, while three signals are observed in the 13C NMR spectrum of F. Propose the molecular structures for compounds A - F, and show the detailed reactions involved in the above chemical transformations.